I feel like I'm missing something here... could someone provide a 10k foot overview of updating the nav for me? 2015 F30 335 USA. I'm not really sure what those additional codes are that people are providing.

I feel like I'm missing something here... could someone provide a 10k foot overview of updating the nav for me? 2015 F30 335 USA. I'm not really sure what those additional codes are that people are providing.